Fracture analysis of ferroelectric single crystals: Domain switching near crack tip and electric field induced crack propagation

2013 ◽  
Vol 61 (1) ◽  
pp. 114-130 ◽  
Author(s):  
Yihui Zhang ◽  
Jiangyu Li ◽  
Daining Fang
Keyword(s):  
Electric Field ◽  
Crack Propagation ◽  
Single Crystals ◽  
Domain Switching ◽  
Crack Tip ◽  
Fracture Analysis

An I-integral method for crack-tip intensity factor variation due to domain switching in ferroelectric single-crystals

2016 ◽  
Vol 94 ◽  
pp. 207-229 ◽  
Author(s):  
Hongjun Yu ◽  
Jie Wang ◽  
Takahiro Shimada ◽  
Huaping Wu ◽  
Linzhi Wu ◽  
...  
Keyword(s):  
Intensity Factor ◽  
Single Crystals ◽  
Integral Method ◽  
Domain Switching ◽  
Crack Tip

Investigations of PMN-PT Single Crystal Performance

2010 ◽  
Author(s):  
Virginia G. DeGiorgi ◽  
E. P. Gorzkowski ◽  
M.-J. Pan ◽  
M. A. Qidwai ◽  
Stephanie A. Wimmer
Keyword(s):  
Finite Element ◽  
Electric Field ◽  
Single Crystals ◽  
Domain Switching ◽  
Fatigue Behavior ◽  
Constitutive Models ◽  
Nonlinear Behavior ◽  
Computational Effort ◽  
Basic Material ◽  
Poling Direction

Application of new materials, such as PMN-PT single crystals, requires a good understanding of basic material performance under both electrical and mechanical loading. Over the past 5 years the authors have used both computational and experimental techniques to examine the relationships between poling direction, crystal orientation, and electric field actuation. Experiments show mixed results indicating that the relationship between material orientation and loading is more complex than originally imagined. In some cases crack initiation and propagation perpendicular to the applied field was observed within a few thousand cycles but in other cases no failure was observed even after a few hundred thousand cycles despite crack growth in the presence of introduced defects. Computational effort quickly identified a gap between development of theoretical constitutive models that addressed domain switching based nonlinear behavior and what was available in workable form as part of commercial finite element codes. This led to the implementation of a macro-mechanical constitutive model which addresses domain switching, into a commercially available finite element code. The rate independent version has been used to investigate issues of electric field actuation and poling direction. Presented here are insights into the fracture and fatigue behavior of piezoelectric single crystals from both experimental and computational studies.

Electric field-induced crack growth and domain-structure evolution for [100]- and [101]-oriented 72%Pb(Mg1/3Nb2/3) O3–28%PbTiO3 ferroelectric single crystals

2008 ◽  
Vol 23 (12) ◽  
pp. 3387-3395 ◽  
Author(s):  
F. Fang ◽  
W. Yang ◽  
F.C. Zhang ◽  
H. Qing
Keyword(s):  
Electric Field ◽  
Crack Propagation ◽  
Single Crystal ◽  
Single Crystals ◽  
Crack Growth ◽  
Domain Structure ◽  
Boundary Structure ◽  
Structure Evolution ◽  
In Situ Observation ◽  
Oriented Single Crystal

In situ observation of the electrically induced crack growth and domain-structure evolution is carried out for [100]- and [101]-oriented 72%Pb(Mg1/3Nb2/3)O3–28% PbTiO3 (PMN–PT 72/28) ferroelectric single crystals under static (poling) and alternating electric fields. On the same poling electric field, domains are in the stable engineered domain state where four equivalent polarization variants coexist for [100]-oriented single crystal, while parallel lines representing the 71° domain boundaries appear for [101]-oriented one. Under the same cyclic electric field, the [100]-oriented single crystal shows much higher crack propagation resistance than that of a [101]-oriented crystal. Apart from the material aspects, such as crystallographic fracture anisotropy and non-180° domain boundary structure, crack boundary condition plays an important role in determining the crack propagation behavior.

Crack tip 90° domain switching in tetragonal lanthanum-modified lead zirconate titanate under an electric field

1999 ◽  
Vol 14 (7) ◽  
pp. 2940-2944 ◽  
Author(s):  
Fei Fang ◽  
Wei Yang ◽  
Ting Zhu
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Lead Zirconate Titanate ◽  
Powder Processing ◽  
Domain Switching ◽  
Crack Tip ◽  
Lead Zirconate ◽  
Processing Technique ◽  
Ferroelectric Ceramics ◽  
Zirconate Titanate

Lanthanum-modified lead zirconate titanate ferroelectric ceramics (Pb0.96La0.04)(Zr0.40Ti0.60)0.99O3 were synthesized by the conventional powder processing technique. X-ray diffraction experiments revealed that the samples belong to the tetragonal phase with a = b = 0.4055 nm, c = 0.4109 nm, and c/a = 1.013. After being poled, the samples were indented with a 5-kg Vickers indenter, and lateral electric fields of 0.4 Ec, 0.5 Ec, and 0.6 Ec (Ec = 1100 V/mm) were applied, respectively. Field-emission scanning electron microscopy showed that 90° domain switching appeared near the tip of the indentation crack under a lateral electric field of 0.6 Ec. A mechanism of 90° domain switching near the crack tip under an electric field is discussed.

Analysis of Domain Switching Zone Near a Crack Tip in Piezoceramics

1999 ◽  
Author(s):  
I. Chang ◽  
C. T. Sun
Keyword(s):  
Stress Field ◽  
Electric Field ◽  
Applied Electric Field ◽  
Domain Switching ◽  
Piezoelectric Materials ◽  
Crack Tip ◽  
Finite Element Program ◽  
Poling Direction ◽  
Element Program ◽  
Switching Criterion

Abstract In this paper, a finite element program in conjunction with domain switching criterion was developed to analyze domain wall switching and its effect on the near tip stress field in piezoelectric materials containing a crack. Domain switching zones in the vicinity of the crack tip corresponding to various combined electric and mechanical loads were obtained. It is found that the size, shape and mode (90° or 180° switching) of domain switching zone near the crack tip depend on the direction as well as magnitude of the applied electric field. For a positive electric field (same as the poling direction), 90° domain switching occurs behind the crack tip, and the zone increases as the applied positive electric field increases. If the applied electric field is negative, then a 180° domain switching zone appears ahead of the crack tip while a 90° domain switching zone exists behind the tip. Moreover, the stress field near the crack tip is found to be significantly affected by the domain switching.

In Situ Observation of Fatigue Crack Growth and 90º Domain Switching for BaTiO3 Ferroelectric Single Crystal under Cyclic Electric Loading

2008 ◽  
Vol 33-37 ◽  
pp. 145-150
Author(s):  
Fei Fang ◽  
Fang Cheng Zhang ◽  
Wei Yang
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Stress Field ◽  
Electric Field ◽  
Crack Growth ◽  
Domain Switching ◽  
Crack Tip ◽  
In Situ Observation ◽  
Alternating Electric Field

In-situ observation of the fatigue crack growth and 90o domain switching was carried out for BaTiO3 ferroelectric single crystals under alternating electric field. It is shown that during the electric cycling, the crack propagates continuously. Parallel lines of 90o domain boundaries can be seen and they flip at each reversal of the alternating electric field. The width of the 90o domain switching zone grows with the number of cycles and its frontal always lies ahead of the crack tip. It is suggested that the cyclic stress field induced by the repeated 90o domain switching at the crack tip, as well as the stress field caused by the electrically activated material between the electrode and the material under the electrodes contribute to the observed fatigue crack growth.

Phase Field Simulation of Ferroelectrics with Cracks

2011 ◽  
Vol 462-463 ◽  
pp. 710-715
Author(s):  
Xiao Fang Zhao ◽  
A.K. Soh
Keyword(s):  
Electric Field ◽  
Mechanical Stress ◽  
Phase Field ◽  
Domain Switching ◽  
Coupling Effect ◽  
Crack Tip ◽  
Relaxor Ferroelectrics ◽  
Relaxor Ferroelectric ◽  
Defect Model ◽  
Ferroelectric Single Crystal

By employing a dipole defect model, two-dimensional phase field simulations of domain switching in the crack tip vicinity of a crack embedded in a relaxor ferroelectric single crystal, which was subjected to mechanical loading and electric field, have been carried out. The interaction between the dipole defects and crack, the influence of the dipole defect concentration density on the switching process, and the coupling effect of mechanical stress and electric field on domain switching in the vicinity of the crack tip have been studied. Comparing the results obtained from relaxor ferroelectrics with those of normal ferroelectrics, the former showed that, due to the interaction between the dipole defects and crack, polarization switching in the vicinity of the crack tip was suppressed. Moreover, the coupling between applied mechanical stress and electric field can either promote or suppress domain switching in the vicinity of a crack.

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